That is a very good wiring diagram. To clarify for you. There are 2 (two) 50 amp breakers in your RV and your diagram shows those. You stated 1 previously and that made me think someone had southern engineered your RV wiring. You diagram shows exactly how a Inverter/Charger is wired to a RV with your design electrical panel. The 30 amp breaker GOING to the Inverter is correct. Then the Inverter OUTPUT goes back to the breaker panel and then that 30 amp breaker distributes the power to those 3 breakers next to it. When on Shore Power, the 120 just goes THRU the Inverter and back to your panel. Since it appears to happen when it gets colder, that points to a LOOSE 120 wiring connection, probably at the Inverter/Charger 120 input and output wiring. Magnums use a screw type system and not wire nuts for the 120 romex wiring. I would check those with a screwdriver. Doug
